برای هر جملهای که ناتمام است، باید فرم صحیح فعل براکتدار را کامل کنید:
19. A new medicine **has been discovered** by the doctors to cure it since last month. (discover)
20. Your sister **is working** very hard to be accepted to the university, isn't she? (work)
21. Jack's money **was stolen** in the train. (steal)
22. These days, your grandfather **can't sleep** well, can he? (sleep)